How the dose is calculated
Ciprofloxacin is generally reserved for specific indications in children (fluoroquinolone use is limited by a cartilage-toxicity signal in animal studies), such as complicated UTI, typhoid fever, or infections with no safer alternative. Dose is calculated in mg/kg/day divided every 12 hours.
Typical dosing by indication
| Indication | Dose | Frequency | Max |
|---|---|---|---|
| Standard | 20 mg/kg/day | every 12h (2×/day) | 1500 mg/day |
| Severe/complicated | 30 mg/kg/day | every 12h (2×/day) | 2000 mg/day |
Clinical use
- Fluoroquinolones like ciprofloxacin are generally reserved in children for infections where no equally effective, safer alternative exists (e.g. complicated UTI, typhoid fever, pseudomonal infection), because of an animal-model signal for cartilage toxicity — this has not been definitively shown to be clinically significant in children at recommended doses, but caution and specialist guidance are still advised.
- Excellent oral bioavailability makes oral ciprofloxacin a reasonable step-down from IV therapy once a patient is clinically stable.
- Absorption is reduced by co-administration with calcium, iron, zinc, or antacids — separate dosing by at least 2 hours.
- Can prolong the QT interval and lower seizure threshold — use caution with relevant comorbidities or interacting medications.
Frequently asked questions
Why is ciprofloxacin not first-line in children?
Animal studies showed a cartilage-toxicity signal with fluoroquinolones, so their use in children is generally reserved for infections (like complicated UTI, typhoid fever, or pseudomonal infection) where no equally effective and safer alternative is available.
Can ciprofloxacin be taken with milk or antacids?
It's best avoided — calcium, iron, zinc, and antacids all reduce ciprofloxacin absorption significantly. Separate dosing from these by at least 2 hours.
What is ciprofloxacin used for in typhoid fever?
It's one of several effective oral options for typhoid fever in regions without high fluoroquinolone resistance, dosed by weight and given for the course length specified by local/WHO treatment guidance.
Does ciprofloxacin need adjusting for kidney function?
Yes — ciprofloxacin is renally cleared, so the dose or dosing interval needs adjustment in significant renal impairment. Check local renal dosing guidance.
References
- World Health Organization. Guidelines for the Management of Typhoid Fever.
- American Academy of Pediatrics Red Book — Fluoroquinolone use in children.
- British National Formulary for Children (BNFc) — Ciprofloxacin.